Audio Transformation Tools

The Audio Transformation Authoring Tools are delivered as a set online java applets and VST plug-ins, an audio plug-in standard created by Steinberg to allow any third party developers to create VST plug-ins for use within VST host applications. The videos below show the functionality of these authoring tools as well as the powerful transformations that can be achieved using them.

VoiceTransformation

Several singing and speech voice transformations are included in this real-time VST plug-in effect. The system uses spectral techniques for modifying the character of the voice. Transformations include: transposition, quantization, vibrato, roughness, breathiness, whisper, timbre mapping and other spectral transformations. This tool is targeted to recording or post-production studios that require voice processing. In the video we can see some of the available transformations applied in real-time to an original male voice.

The Java applet version of the Voice Transformation tool, allows any user to run the voice transformation tool within the web browser. The applet sends the recorded user�s voice to a server that transforms the voice based on the transformation parameters chosen by the user from eight different presets and the server sends back the transformation audio file to the client, you can test the applet online (you just need java installed in your machine).

Tempo & Pitch Transformation

This VST plug-in combines automatic rhythm analysis and time-scaling in order to transform the rhythm of an audio mix. An input audio is first pre-analyzed in order to extract a musical rhythm description. After this process, the user can vary the tempo or add/subtract swing by using the GUI controls during the playback. In the video we can see how easily is, using this VST instrument plug-in, to modify in real-time the tempo of a song being played or adding a swing effect to it.

The java applet version of the Tempo Transformation tool incorporates also pitch transformation for music; this allows transforming tempo and pitch for any mp3 or wave file. The user just drags a sound file to the applet running on the browser and then modifies each of the envelope curves (allows variable pitch and tempo transformations), then pressing the transformation button, the server transforms the file and returns back the transformed file to the client.

You can test the tempo/pitch transformation applet online.

Advanced Audio Equalizer

This VST plug-in is aimed for the advanced equalization of commercial music productions. This is a powerful tool able to equalize the audio using energy histogram-based on different criteria. It is not limited to the typical energy distribution versus frequency, but it allows working with other useful energy distributions criteria such as panning, inter-channel phase difference, or energy variance. Some of its applications include: Remixing a piece by changing the volume of each instrument independently or removing instruments from the mix and then re-adding them processed by some effects or isolate one or several instruments to perform a musical analysis of a piece. In the video we can see how to mute or isolate guitar and voice from a commercial song very easily using the graphical user interface of the plug-in.

Links & Downloads

High resolution version of Voice Transformation video (13 MB, WMV)

High resolution version of Tempo Transformation video (15 MB, WMV)

[link target="_blank" dest="UPF_TempoAndPitchTransformationWeb_UPF.wmv"]High resolution version of Tempo/Pitch Transformation video[/link] (19 MB, WMV)

High resolution version of Advanced Audio Equalizer video (13 MB, WMV)

	SALERO is co-funded by the European Union through the IST programme under FP6.
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